Cooling system



Dec. 5, 1939. G. L. USSELMAN 2,131,953

COOLING SYSTEM Filed March 24, 1936 TRANSMITTER Ell/LUNG) GROZ/A/D SURFACE? INVENTOR GEORGE L. SSELMAN ATTORNEY Patented Dec. 5, 1939 COOLING SYSTEM George-Lindiey Usselman, Rocky Point, N. 2., assignor to Radio Corporation of America, a corporation of Delaware Application March 24, 193g, Serial No. 70,711

. 1 Claim. This invention relates to a new and novel coolins System which is particularly adapted to cooling the tubes of a radio transmitter located in a vmore or less isolated region.

I An object of this invention is to provide a system for cooling the tubes of a radio transmitter .by having the circulating cooling fluid forced through a system of pipes or reservoirs buried below the surface of the ground.

10 A feature of this invention is a novel means ,of combining a reservoir below the ground level of a transmitter building and connecting the reservoir with an underground system of circulating pipes which is cooled by the passage of a circull lating fluid through the pipes.

' While cooling systems generally are well known in the art, they are of the ordinary or open-surface type. Such cooling systems are'subject to several disadvantages, the principal one being .9 that the cooling fluid generally evaporates more or less rapidly and in systems employing waterv as a'circulating cooling fluid,it is generally likely to freeze in cold weather. These serious disadvantages are overcome by this invention.

I This invention is particularly desirable when it is found necessary to locate one or more transmitters away from the main or central transmittingplant for the purpose of reducing the length of the antenna transmission line. Also, it

) is frequently desirable to locate the transmitter near the antenna without the use of the usual housing by substituting an outdoor transmitter covered only by a small housing or shed. In-such remotely located transmitters because of the gen- 85' eralabsence of the ordinary water mains, it is necessary that a reliable evaporation proof. freeze-proof, closed or semi-closed cooling system be employed. V

Briefly, this invention consists ofa system of so pipes or reservoirs buried in the ground below 1 the frost line, which is deep enough to insure good cooling. Such an arrangement tends to maintain the cooling fluidat a fairly constant temperature both in winter and summer. 45 Thisinvention will be more completely understood by referring to the accompanying drawing, in which: I

- Fig. '1' is a sectional view of the general cooling arrangement;

60 Fig. .2 is a detail of the cooling pipes, parallel arranged; and v Fig. 3 is a detail of a star-shaped arrangement of cooling pipes.

Referring-now in detail to Fig. l, the transll mitter housing I is shown located above a reser- 'voir or sump pit 2. Mounted upon the door of the housing i there is located a motor 4, watercooled transmitter tube and cooling coil 6, the transmitter tube 5 being insulatedly secured on the wall of housing I by insulator I. The hous- 5 ing l is provided with suitable power supply leads 8 and also antenna leads 9 and I0. An outlet insulated pipe H returns the circulating fluid to the reservoir 2. Located in the sump pit 2 is a pump l2 which is preferably of the vertical l0 typeand may be driven by a shaft l3 extending down from motor 4. The levelof the water or circulating fluid in reservoir 2 may be maintained at any desiredglevel, preferably at a level indicated at H, whichis a little higher than the pump I2. The pump inlet 15 located at the lower level of reservoir 2 draws water or any suit- 7 able cooling fluid to pump i2, which forces it through the pump outlet pipe l6 into the lower pipe I'I.v The liquid travels the length of the m pipe-l1 up the short pipe l8 and into pipe l9, thus returning to the reservoir 2. At-this point, it rises up in a pipe through the insulating coil 6 which is usually a rubber hose, into transmitting tube or tubes 5 and returns to the reservoir by means of outlet pipe l -l. During this circuit travel of the liquid, it is cooled by delivering its heat into the ground. The cooling fluid from pipe 20 passing through the insulating tube of rubber or glass or other insulatingmaterial 3o circulates into the bottom of tube jacket 2|. The water jacket of tube 5 absorbs the heat from the tube anode which is inside the tube jacket and flows out at the top of the tube Jacket into outlet pipe II It is desirable to have a small drain hole 21 in the lower end of pipe 20 to allow the liduid in, the upper section ofthis pipe and in the tube waterfiacket to drain" in order to prevent freezing when the transmitter is shut down.

Referring now to Fig. 2 of the drawing,'there 40 is shown a specifl'c'mo'diflcation of cooling pipes wherein the submerged cooling pipes i1 and I! are connected with a plurality of parallel arranged pipes 22, which are connected together by T fittings 23 and short links 24, the last pipe being connected by elbows 2'. Such an arrangement of parallel pipes is particularly desirable where it is necessary to obtain additional cooling surface without making the water circuit as long.

In Fig. 3, another circulating pipe arr'auge- 0 ment is shown wherein pipes l1 and II are spread out in the ground by the star-shaped pipe arrangement. 26. While several arrangements of cooling pipes and a single arrangement of transmitter and reservoir is shown. it is distinctly understood that this invention is not to be limited to the one shown but is capable of taking other modifications and therefore should not be limited to those shown, except such limitations as are 5 clearly imposed in the appended claim.

10 the normal operation thereof, said system including a subterranean pool of liquid, said element having a liquid inlet and liquidoutlet topermit a liquid flow therethrough, a pipe system having 7 a first portion connected to the inlet of saidele- 5 ment to maintain said liquid in heat absorbing relation therewith, a second portion of said pipe system in series with the first mentioned portion to maintain said liquid in heat exchange relation with the ground below the surface thereof, said first mentioned portion having an outlet pipe connected to the outlet of said element and arranged to discharge said liquid intosaid pool after it passes through said element. a pump arranged to draw liquidfrom said pool and force it through the pipe system, element, outlet pipe and back to said pool, and a small aperture in the lower part of said first mentioned portion of said pipe system to permit drainage of the liquid from said element when the pump is inoperative.

GEORGE LINDLEY UssErMaN. 

